Low-Carbon Preparation of Ceramic Tiles from Building Ceramic Solid Waste by Simulating Hydrothermal Alternation
Ceramics are usually sintered over 1 000 ℃,which leads to 60％energy consumption of ceramic production process.Low temperature sintering is a key factor for energy saving and carbon reduction of ceramic industry.This article proposes a low-carbon method for preparing ceramics by simulating hydrothermal alteration reaction at 200 ℃ using ceramic solid waste as raw material.Waste ceramics were firstly pre-treated by ball milling to obtain submicron powder.Ceramic tiles were prepared from ceramic powder by hydrothermal alteration simulation.Under the optimal condition of 6 h ball milling of ceramic waste solid,25％water content of submicron powder,K2SiO3 solution and 36 h reaction at 200℃,the flexural strength of the final product can reach(32.1±4)MPa fitting application requirement of ceramic tiles.X-ray diffraction,Fourier infrared spectroscopy and scanning electron microscopy were used to characterize the physical phase composition,functional group structure,and microscopic morphology of the samples before and after the reaction,and a possible reaction mechanism was given.It is confirmed that orthoclase and α-quartz crystals are produced during the hydrothermal etching reaction,and the growth of these two crystals effectively improves the flexural strength of ceramic tiles.
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